Minor cleanups

Biggest is scaling back the List<?> comparator in YamlTester (sorry!). It only needs a consistent ordering and strictness about types happens (should, rather) when comparing the results. Additionally, made it more defensive about input that won't be handled correctly.

YamlTesterIT needed to react to the changes.

And lastly, make sure ORDER BY is always used with output_already_ordered in the yamls.